We demonstrate broadband supercontinuum (SC) generation in a single-mode fluoride (ZBLAN) fiber pumped by
1.55 μm nanosecond pulses amplified in a cascade of fiber amplifiers. The recorded spectrum spread from ~ 900 nm to
3600 nm. The total output power was measured to be 0.66 W in entire spectral band. Over 65% of this power
corresponded to wavelengths longer than 1.65 μm. The SC spectrum was generated in two steps: first the ~1 ns pulses
were broken in a single-mode silica fiber (SMF) into a train of shorter sub-pulses leading to initial spectrum extension
(from ~1.4 to 2.2 μm) and then the spectrum was further broadened into a ZBLAN fiber. The performance of the SC
source is described.